Stamp duty is roughly 5% of the basic flat cost..to be specific..Stamp Duty = {[(Area)x(Rate) + carparking + MSEB] - 5,00,000} 5% - 7,600, you need to round off the last two digits and add 10 to the final amount and registration is Rs. 30000 or 1 % of basic cost.. whichever is less.